Multiple-blade knife switch



Sept. 23. 1924.- I. R Sam 1509,01;

MULTIPLE BLADE KNIFE. SWITCH FiledAuZ- 26. 1921 mum M M U H Patented Sept. 23, 1924.

UNITED STATES PATENT OFFICE.

IRA R. SELTZER, 0F WATERBURY, CONNECTICUT, ASSIGNOR TO THE GORDON ELEC- TRIC MANUFACTURING COMPANY, OF WATERVILLE, CONNECTICUT, A CORPORA- ZIPION.

MULTIPLE-BLADE KNIFE SWITCH.

To all whom it may concern:

Be it known that I, IRA R. SELTZER, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Multiple- Blade Knife Switches; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in-

Fig. 1 a plan view of a multiple-blade knife-switch embodying my invention.

Fig. 2 a view thereof in side elevation.

Fig. 3 a view in vertical transverse section on the line 33 of Figure 1, showing only the switcl1blades, the two-part insulating bridge connecting them, and the operatingclip.

Fig. 4 a detached perspective view of the blades, showing the lower or coupling-plate of the bridge as riveted to the two switchblades.

Fig. 5 a perspective view of one of the switch-blades.

Fig. 6 a detached reverse perspective view of the upper or cover-plate of the bridge.

Fig. 7 a detached perspective view of the lower or coupling-plate of the bridge.

My invention relates to an improvement in multiple-blade knife-switches, the object being to provide improved insulating means for coupling the blades thereof to provide for their operation together.

With this end in view, my invention consists in certain details of construction and combinations of parts as will be hereinafter .described and particularly pointed out in the claim.

For the purpose of illustration, I have shown my invention as applied to a knifeswitch of two blades, though obviously it is not so limited. As shown, the blades 10 and 10 are provided upon the upper edges of their forward ends with integral shouldered lugs 11, each having an upwardlyprojecting fiat rivet 12. An oblong lower or coupling-plate 14 of insulating material, provided at its ends with rectangular perforations 15, is set down over the said rivets 12, so as to rest upon the shoulders 13, by means of which the lower face of the blade is supported well above the upper edges of the blades 10 and hence out of any possible contact with the spring-clips 16 of the switch. The projecting upper ends of the rivets 12 are then headed down upon the upper face of the plate 14, as clearly shown in Figure 4. A complementary upper or cover-p1ate 17 of insulating material is then applied to, or superimposed upon, the upper face of the coupling-plate 14, to which it is secured by a machine-screw 18 passing through central perforations 19 and 20 in the two plates, whereby they are rigidly secured together, the lower face of the upper plate 17 being formed at its ends with recesses 21 provided for the clearance of the swaged heads 22 of the rivets 12, as shown in Figure 3. As shown, the machine-screw 18 provides for the attachment of a sheetmetal clip 23 designed for connecting the switch with an operating-handle or the clip may be itself used as an operating-handle, or it may be removed and the two insulating plates be grasped directly for operating the blades. The coupling and cover-plates together form an insulating bridge in which there is no metal extending between the blades. I wish particularly to point out the simplicity of the insulating connection between the two blades and the thoroughness of the insulation efiected thereby. The blades are mounted in clips 24 mounted upon a porcelain block 25 of any approved form.

I claim:

In a knife-switch, the combination with a plurality of parallel pivotal switch-blades having integral upstanding rivets, of a conpling-plate of insulating material transversely-arranged upon the upper edges of the said switch-blades for the upward passage through it of the said rivets, which are upset upon its upper face, a cover-plate In testimony whereof, I have signed this of insulating material superimposed upon specification in the presence of two sub- 10 the said coupling-plate and adapted to scribing Witnesses. cover the swaged ends of the said rivets, a

switch-handle, and means located between the switch-blades and their rivets for se- Witnesses: curing the said cover-plate and the said HILDA R. BRooKs, switch-handle to the said coupling-plate. ALBERT H. Pos'r.

IRA R. SELTZER. 

